NSK 6905 ZZ C3 Ball Bearing

Main Description

The NSK 6905 ZZ C3 is a high-performance deep-groove ball bearing designed for demanding industrial and mechanical applications. With precise dimensions of 25 mm inner diameter, 42 mm outer diameter, and 9 mm width, this single-row bearing provides reliable support under radial loads while maintaining compact form factor.

Applications

This deep-groove ball bearing is ideally suited for industrial machinery, motor shafts, gearboxes, and bearing housings. Its compact size makes it a preferred choice for bearing units and enclosures, where space constraints meet operational reliability requirements. Thanks to its durable design, it performs well in systems requiring continuous rotation, such as conveyors, electric motors, and precision drives.

Key Advantages

• Increased Internal Clearance (C3): The C3 designation ensures greater radial play, allowing this bearing to handle thermal expansion and misalignment, making it ideal for high-temperature or press-fit applications.

• Metal Shields (ZZ): Double-sided steel shields protect against dust and contaminants while permitting efficient lubrication, combining longevity with fast spinning.

• Durable Material: Constructed from high-grade bearing steel, the NSK 6905 ZZ C3 offers high wear resistance and long service life under industrial operating conditions.

• Sheet-Steel Cage: Lightweight yet robust, the cage ensures stable ball guidance and reduces rotational friction.

• Thermal Range: Engineered to operate reliably within typical industrial temperature spans, making it a versatile choice for many environments.

Technical Specifications

• Bore (d): 25 mm

• Outer Diameter (D): 42 mm

• Width (B): 9 mm

• Type: Single-row deep groove ball bearing

• Internal Clearance: C3 (increased)

• Shielding: ZZ (metal shields on both sides)

• Material: Bearing-grade steel

• Cage: Sheet steel

• Precision Class: Standard industrial tolerance

• Operating Conditions: Suitable for continuous operation in industrial systems with moderate to high temperatures

The NSK 6905 ZZ C3 is engineered for long-term performance, combining high durability with smooth operation. Its open-lubrication design and increased clearance make it especially suitable for assemblies requiring both longevity and thermal stability.

FAQ

Q1: What does the “C3” in NSK 6905 ZZ C3 mean?
A1: The “C3” designation refers to increased internal radial clearance, which helps accommodate thermal expansion, misalignment, and shrink fits.

Q2: Are the “ZZ” shields sealed permanently?
A2: The “ZZ” term indicates steel shields on both sides. These are non-contact shields—they protect against contamination while allowing relubrication.

Q3: Which industrial applications is this bearing best for?
A3: Ideal for industrial applications such as gearboxes, motor shafts, bearing housings, conveyor systems, and other assemblies with moderate to high rotational speed.

Q4: What materials are used in this bearing?
A4: The bearing is made from high-quality bearing steel, while the cage is constructed from sheet steel for durability and lightness.

Q5: Can this bearing handle high temperatures?
A5: Yes — thanks to its C3 clearance and metal shields, it can operate reliably under moderate to elevated industrial temperatures.